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BitDefender Protects Against Zero-Day Microsoft Word Bug

July 2008

The BitDefender Labs released a signature update to protect clients against the latest unpatched Word exploit.

The vulnerability affects Word 2002 SP3 , could be exploited by an attacker to "gain the same user rights as the local user", according to Microsoft. The exploit is already being used in the wild.

"The samples we retrieved were already being detected as malicious by BitDefender software, as the exploit was being used to drop a malicious executable file that we had already signed. As of this morning, we've also added detection for the exploit itself, blocking this avenue of attack against our clients once and for all" explained Senior BitDefender AV Researcher Attila Balazs.

The dropped component is a backdoor detected by BitDefender as Backdoor.PoisonIvy.CV. Once installed, PoisonIvy grants complete control over the affected computer to an attacker.

Malicious files containing the exploit are detected by BitDefender as Exploit.Word.MS-953635.A. The vulnerability itself is detailed in Microsoft Security Advisory 953635. An analysis of the PoisonIvy backdoor variant used in the attacks is ongoing and will be published on the BitDefender website as soon as possible.